Need help with my Samsung Q1 Ultra Tablet!!!?

I recently bought 2 Samsung Q1 Ultra Tablets and both of them would tell me that no operating system was found during the bootup. So I figured if I bought an external CD/DVD drive that I could use the Windows Recovery disk to fix the problem so I purchased it and changed the boot order so that the external CD/DVD drive would be 1 on the list and it fixed one of my Samsung Q1's but with the other one it still gives me the "No Operating System Found" error. I've changed the boot order so that the external CD/DVD drive was 1 on the list and it still doesn't bring up the menu to install Windows. Can someone please help me fix this problem?